Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f835cab4523cd9f…

MALICIOUS

PDF

44.2 KB Created: 2020-10-18 04:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d79c71af240bb0d0dc56357461a620de SHA-1: 49cfb2a611c4cb75e8fdab53a64c38a0a54dcd17 SHA-256: 0f835cab4523cd9fa4f8f967bfe529a7ec0232673ba046c41cec638068205544
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous embedded links, many pointing to a redirector URL (https://ggtraff.ru/strik?keyword=metodo+simplex+minimizar+ejercicios) which is flagged as malicious. The document also includes links to a large number of PDFs hosted on Shopify, suggesting a link farm or SEO manipulation tactic to obscure the malicious redirector. The ML classifier strongly indicates maliciousness, and the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ggtraff.ru/strik?keyword=metodo+simplex+minimizar+ejercicios In PDF document text
    • https://vopevejefed.weebly.com/uploads/1/3/1/6/131606133/fitureji_benonudurivel_vunodekuvos_xapilirav.pdfIn PDF document text
    • https://jawowigo.weebly.com/uploads/1/3/0/7/130774982/guligorajiwuv-bigixibipasi-xinerajekipo-napixaromivus.pdfIn PDF document text
    • https://besavikeneg.weebly.com/uploads/1/3/2/8/132815808/somudemudi_mirisaxof_bivifozur.pdfIn PDF document text
    • https://wivupenoremew.weebly.com/uploads/1/3/0/7/130775018/pamosimewelaxivilata.pdfIn PDF document text
    • https://riwisasivituw.weebly.com/uploads/1/3/1/0/131070703/panemunefufam.pdfIn PDF document text
    • https://jivexine.weebly.com/uploads/1/3/1/3/131380908/2964153.pdfIn PDF document text
    • https://zuragani.weebly.com/uploads/1/3/1/4/131438510/faketevadu.pdfIn PDF document text
    • https://juragubiv.weebly.com/uploads/1/3/0/8/130874328/pudide_gonojewo.pdfIn PDF document text
    • https://kokubexajaluk.weebly.com/uploads/1/3/2/6/132681668/e239ddea316.pdfIn PDF document text
    • https://vuzevarezevarot.weebly.com/uploads/1/3/0/7/130740461/2244882.pdfIn PDF document text
    • https://nasinapalu.weebly.com/uploads/1/3/0/7/130739684/mokeki.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/safado-fodidunixoso.pdfIn PDF document text
    • https://rabifupokuwu.weebly.com/uploads/1/3/1/1/131164250/91d2d21.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/kirorafagosox.pdfIn PDF document text
    • https://bizumoku.weebly.com/uploads/1/3/2/6/132681494/tevin-jozowitup-jaworig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0127/3750/files/31296472981.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/7231/8366/files/fanoranumejerukila.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3470/6069/files/71154543742.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6153/3089/files/e_track_accessories_lowes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/8721/9867/files/nice_guidelines_ischaemic_foot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7112/7206/files/3175087558.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7090/6780/files/ukulele_songbook_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/3504/0188/files/linear_regression_assumptions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/4374/0571/files/36573785759.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/5587/6762/files/kanerizilazikufunopabikot.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4371/5222/files/zekowitemuradajobuse.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/9462/0333/files/kirchhoffs_voltage_law_examples.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AFC 5416 bytes
SHA-256: a17e40d03d9bf29427f9890d26daa8d72c917d43ef772d6982590e34203eee66
font_01_sfnt_off00007d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D67 11088 bytes
SHA-256: 5ebdf68adc7e538449a6c6d273f955241829a2069e47a6e97b6ae2a95cf537d3

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